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   难度：Easy
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   <h1 class="question_title">
    345. Reverse Vowels of a String
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   <p>
    Write a function that takes a string as input and reverse only the vowels of a string.
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   <p>
    <strong>
     Example 1:
    </strong>
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   <pre>
<strong>Input: </strong><span id="example-input-1-1">"hello"</span>
<strong>Output: </strong><span id="example-output-1">"holle"</span>
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    <p>
     <strong>
      Example 2:
     </strong>
    </p>
    <pre>
<strong>Input: </strong><span id="example-input-2-1">"leetcode"</span>
<strong>Output: </strong><span id="example-output-2">"leotcede"</span></pre>
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   <p>
    <b>
     Note:
    </b>
    <br>
    The vowels does not include the letter "y".
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    &nbsp;
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   <h1 class="question_title">
    345. 反转字符串中的元音字母
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   <p>
    编写一个函数，以字符串作为输入，反转该字符串中的元音字母。
   </p>
   <p>
    <strong>
     示例 1:
    </strong>
   </p>
   <pre><strong>输入: </strong>"hello"
<strong>输出: </strong>"holle"
</pre>
   <p>
    <strong>
     示例 2:
    </strong>
   </p>
   <pre><strong>输入: </strong>"leetcode"
<strong>输出: </strong>"leotcede"</pre>
   <p>
    <strong>
     说明:
    </strong>
    <br>
    元音字母不包含字母"y"。
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